Java实验报告三

1、天津商业大学学生实验报告开课实验室：现代信息交流中心403 开课时间: 2015年*月*日 实验报告: 2015 年 04 月 17日 学院名称信息工程学院年级、专业、班计科学号姓名同组姓名无课程名称Java程序设计实验项目名称Java面向对象程序设计（2）指导教师尉斌实验类型验证 综合 设计 创新 成绩教师评语 教师签名： 年 月 日一、 实验目的：熟悉类、对象、方法、继承和多态的使用方法。二、 实验内容：1. 创建一个Point类，包含坐标x、y。然后创建一个Line类，定义两个读写属性start和end，数据类型为Point，定义Line类方法（计算start和end之间的距离，并打印s

2、tart和end坐标以及距离信息）。2. 根据下面类图，设计一个名为Student的类，包括属性“学号”、“姓名”以及3门课程“数学”、“英语”和“计算机”的成绩，包括的方法有计算3门课程的“总分”、“平均分”、“最高分”及“最低分”。在此基础上，使用数组来实现对多个学生的管理。编写一个控制台应用程序，实现如下菜单功能。3. 题目：品尝饮料要求：（1）使用键盘输入参数（饮料类型），输出该饮料类型的味道，如：当键盘输入参数为1时，结果见图1：（2）如果没有该种饮料，结果见图2：实现步骤：（1） 建立一个Java抽象类Drink，应当：a、 声明一个抽象方法taste( )，该方法负责输出饮料的味

3、道；b、 声明int型常量来代表不同的饮料类型（咖啡、啤酒、牛奶）c、 声明静态工厂方法getDrink(int drinkType)，根据传入的参数创建不同的饮料对象，并返回该对象，建议使用switch语句。（2） 建立Drink的具体子类：a、 分别建立Drink的子类：Coffee（代表咖啡），Beer（代表啤酒），Milk（代表牛奶）；b、 实现taste（）方法，要求在屏幕输出中打印各自的味道特征。（3） 建立Test测试类，测试以上内容的正确性a、 编写main方法，通过命令行传参的方式传入某种饮料的类型。b、 在main方法中，调用Drink类的getDrink方法，获得相应的饮

4、料对象。c、 然后调用该饮料的taste（）方法，输出该饮料的味道。三、 源代码清单：1 源代码清单public class Point public static void main(String args)Point point1=new Point(1,2);Point point2=new Point(4,6);Line line1=new Line(point1, point2);System.out.println("The distance is "+line1.line()+"nThe start is "+"("+l

5、ine1.start.x+","+line1.start.y+")"+"nThe end is "+"("+line1.end.x+","+line1.end.y+")"); double x;double y;Point()Point(double x, double y)this.x=x;this.y=y;class Line Point start;Point end;Line()Line(Point newStart, Point newEnd)start=newSt

6、art;end=newEnd;public double line()return Math.sqrt(end.x-start.x)*(end.x-start.x)+(end.y-start.y)*(end.y-start.y);2源代码清单public class Student String stuno;String name;float math;float english;float computer;Student() Student(String stuno, String name, float math, float english, float computer)this.s

7、tuno=stuno;=name;this.math=math;this.english=english;puter=computer;public String getStuno() return stuno;public void setStuno(String s) this.stuno = s;public String getName() return name;public void setName(String n) = n;public float getMath() return math;public void setMath(floa

8、t m) this.math = m;public float getEnglish() return english;public void setEnglish(float e) this.english = e;public float getComputer() return computer;public void setComputer(float c) puter = c;public double sum() return math+english+computer;public double avg()return (math+english+computer)/3;publ

9、ic double max(double max)if(math>=english)if(math>=computer)max=math;else max=computer;else if(math<english)if(english<computer)math=computer;elsemax=english;return max;public double min(double min)if(math<=english)if(math<=computer)min=math;elsemin=computer;else if(math>english

10、)if(computer>english)min=english;else min=computer;return min;public class Manager extends Student private Student student = new Student100;private static int numberOfStudent = 0;int getNumberOfStudent() return numberOfStudent;Student getStudent() return student;boolean addStudent(Student student

11、) try this.studentnumberOfStudent = student;numberOfStudent+;return true; catch (Exception e) return false;boolean removeStudent(String stuno) boolean target = false;for (int i = 0; i < numberOfStudent; i+)if (studenti.getStuno().equals(stuno) studenti = null;target = true;return target;Student f

12、indStudent(String s) for (int i = 0; i < numberOfStudent; i+)if (studenti != null)if (studenti.getStuno().equals(s)| studenti.getName().equals(s)return studenti;return null;boolean changeStudent(Student student) for (int i = 0; i < numberOfStudent; i+) if (this.studenti.getStuno().equals(stude

13、nt.getStuno()| this.studenti.getName().equals(student.getName() this.studenti = student;return true;return false;void print() System.out.println("学号t姓名t数学t英语t计算机");for (int i = 0; i < numberOfStudent; i+)if (studenti != null) System.out.println(studenti.getStuno() + "t"+ stude

14、nti.getName() + "t" + studenti.getMath()+ "t" + studenti.getEnglish() + "t"+ studenti.getComputer();void caculate() float max_math = 0, min_math = student0.getMath(), sum_math = 0;for (int i = 0; i < numberOfStudent; i+) sum_math += studenti.getMath();if (studenti.ge

15、tMath() > max_math)max_math = studenti.getMath();else if (studenti.getMath() < min_math)min_math = studenti.getMath();float avg_math = sum_math / numberOfStudent;float max_english = 0, min_english = student0.getEnglish(), sum_english = 0;for (int i = 0; i < numberOfStudent; i+) sum_english

16、+= studenti.getEnglish();if (studenti.getEnglish() > max_english)max_english = studenti.getEnglish();else if (studenti.getEnglish() < min_english)min_english = studenti.getEnglish();float avg_english = sum_english / numberOfStudent;float max_computer = 0, min_computer = student0.getComputer(),

17、 sum_computer = 0;for (int i = 0; i < numberOfStudent; i+) sum_computer += studenti.getComputer();if (studenti.getComputer() > max_computer)max_computer = studenti.getComputer();else if (studenti.getComputer() < min_computer)min_computer = studenti.getComputer();float avg_computer = sum_com

18、puter / numberOfStudent;System.out.println("学科t平均成绩t最高分t最低分");System.out.println("数学t" + avg_math + "t" + max_math + "t"+ min_math);System.out.println("英语t" + avg_english + "t" + max_english + "t"+ min_english);System.out.println(

19、"计算机t" + avg_computer + "t" + max_computer + "t"+ min_computer);import java.util.Scanner;public class TestStudent public static void main(String args) Manager manager = new Manager();System.out.println("1.添加学生n2.删除学生n3.查询学生n4.修改学生n5.打印学生n6.统计学生n7.退出");Scanner

20、scanner = new Scanner(System.in);boolean flag = true;while (flag) int input = 9;try input = scanner.nextInt(); catch (Exception e) System.out.println("Wrong operation.");flag = false;switch (input) case 1:System.out.println("Enter the student's information(stuno,name,math,english,

21、computer):");Student student1 = new Student();student1.setStuno(scanner.next();student1.setName(scanner.next();student1.setMath(scanner.nextFloat();student1.setEnglish(scanner.nextFloat();student1.setComputer(scanner.nextFloat();if (manager.addStudent(student1)System.out.println("success.&

22、quot;);elseSystem.out.println("fail.");break;case 2:System.out.println("Enter the stuno:");if (manager.removeStudent(scanner.next()System.out.println("success.");elseSystem.out.println("fail.");break;case 3:System.out.println("Enter the stuno or name:&quo

23、t;);Student student3 = manager.findStudent(scanner.next();if (student3 != null) System.out.println(student3.getStuno() + "t"+ student3.getName() + "t" + student3.getMath()+ "t" + student3.getEnglish() + "t"+ student3.getComputer(); elseSystem.out.println("

24、;There is no such a student.");break;case 4:System.out.println("Enter the changed student(stuno,name,math,english,computer):");Student student4 = new Student();student4.setStuno(scanner.next();student4.setName(scanner.next();student4.setMath(scanner.nextFloat();student4.setEnglish(sca

25、nner.nextFloat();student4.setComputer(scanner.nextFloat();if (manager.changeStudent(student4)System.out.println("change success.");elseSystem.out.println("change fail.");break;case 5:manager.print();break;case 6:try manager.caculate();break; catch (Exception e) System.out.println("there is no student.");case 7:flag = false;System.out.println("退出。");break;default:System.out.println("Wrong operation.");3. 源代码清单public abstract class Drink public abstract String getTaste();int drinkType; int Coffee=1;i